Unwanted contract

I was on the MTN website looking at various contracts as my mobile contract was due for upgrade. Inadvertently I processed a Sim only contract which is totally irrelevant for me. I did not know at the time that I had completed the online process. I recieved a message saying that the contract had been approved, I tried several times tthrough the call Centre and the local MTN shop to revert back to my old contract, all with no luck, I am just sent from pillar to post! In the first telecon I was assured that Before the contract was finalized, I would be contacted telephonic ally to confirm all the details. This DID NOT HAPPEN. I have now since sent 3 emails to the complaints email address, I have not even had the courtesy of a reply. ABSOLUTELY TERRIBLE CUSTOMER SERVICE SHOWS TOTAL UNWILLINGNESS TO PROVIDE ANY EXPLANATION OR COME TO ANY MUTUAL AGREEMENT.. THIS DESPITE MY OLD CONTRACT PAYMENT BEING R350.00 p/month AND THE NEW CONTRACT BEING ONLY R169.00p/month

WHAT DOES A PERSON NEED TO DO TO GET A RESPONSE?